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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b207b6ca6c9b05bc475577e99d4634d01fcd98d66b2eed04a4182d38ed0e0ffc' 
  AND token = 'iCYqMlvb3n3J33mtjqnNG++IOW0/YHN3TKkRLhVtOTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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