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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbc5913682c7d8a5c35e8698e782c2a74b6ed13827e271e8ecb05d70dd9c44f' 
  AND token = 'As5FlsbrA4yzk9c6JBR3DWf7Nq20ABHUCsu1zvASlBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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