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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7d1bfc2de9dcc7914d8f8874d8f52c5ef6e21b9a154382970af98f6155adfa' 
  AND token = '26cp1gsUESE6wdeg83UqEC90bilGVQBOmjs66aaZlbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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