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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f5168a5ea00ddef45ab2e331fba9426bfb390fc6867f9d10e6081e6260b9de' 
  AND token = 'oqrg7rGMM6p2FlWa7gg9QuI+O4Xlsz763tbgK/FcPKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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