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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee358e4bbcff203721cf3936e05697c68f0d1da4c2282ea5e5a07551269eb702' 
  AND token = 'lZY6FCxZXfg1Gidfa0Nm1NvKg2zLLT7JHDa5gcl+b78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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