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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0b1d2ef15aedb47a464f5f2a2efd2355243e57b8349ab556933f68fa4d0e0b' 
  AND token = 'ThylE6IDKHiiudQsnnqKOTJ0iC2ISGveRsB7fvl2amU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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