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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb020a8f6fe87145c2a210f581cac5e37b54a37247280d8c4a3d50994c5e5bb1' 
  AND token = 'WihHwAXdn+X15VuoqJUBkl3Q0ik0SMmI+OBVBBduor4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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