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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e646b96277a392b20f6350e49267c3e58e9cda87bdd21f32c3e8aefe0dceeb' 
  AND token = '9USgrrB8WlDo+RVrFCG1JyLs4O9OxFPyaIuKPJMDVgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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