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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4c2a0a2f0fbd591457613c1b15c4657bca9b26ed6959031da5e3b1cbec6943' 
  AND token = 'HUjWK0+r1gZiXFdbewVkwoGU4Mrw6VOtIUCAlpoi7K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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