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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582ac1165e7756c75f8337992ffe44a0b900014c1ff290e6d6b3a72b5ce006e9' 
  AND token = '7ZnO0G5tengFWDsb+aCvoIzlLR+7rl13SIEE0kkoE5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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