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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d0c9f31f201b62c7d1d0ade3f3c2c712c7cf1065c08229c38b763ec39f28e2' 
  AND token = 'W/kjKXxmq30iKiBu0LHPWkj1SN7CbRZjN3omicNxy6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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