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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee669d21e244495714ad88f156863830cbb425f38662b8cf6dfcecbeb825c605' 
  AND token = 'RlcD4O9fZZ/IoodUhkIyqtfS0xq6qU8UHo6JGsShZHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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