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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec3c70990f8bd1b6c9764bb4fba24a49f5667600eebb4aac7ee982e6719fdf5' 
  AND token = 'tTtMzYUqImr20UFsBqCdFpS5qHDorIu2g4AX38kLRVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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