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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb0e1403d26526b58ef5ba3529e60e67f7f8191b3dc30e08738eb73941d7455' 
  AND token = 'dZrY4B2Ss1pzVWaPDIG0sObyQmXR3fhxj29dXmmjjqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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