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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0394c1ff85b57c7416ab83e9076fc8ba1f9f24cb7b88f279b5e450e88e43445' 
  AND token = 'CWYcnFheA4budntaDxUeFop9jtjBOc0IQF42q9dM+VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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