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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bc689eb088f1eb314e6607d12a2298c00dee9fea0c47346440b91d5d722344' 
  AND token = 'anVjADRoQqx9PIP7aUz1JheseaJn+2BEcAIpeu2ibPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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