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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284255ce8edef20ed5d482c7e3abe0756059594f04dceec4e6c75e6231b0480a' 
  AND token = 'B0A4UMJpKo9hfH7awX3o5lNWuvHJ1EHGGcdaPNK+3IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}