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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057667acbae0b0b677fd82b59a2cc499b917d794c55aa6b6c61e6b0e7c8132ac' 
  AND token = 'T3Fz3dYvjpenLB3sh3LIK5gtwD+1lK5ucdvENcC4Tdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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