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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd6de3a179ba7692f5d09b1bd591b0ce75c249c0367c808a8121f389b4471f1' 
  AND token = 'oQ3okr12sOAZsYL8hnp8ZnOBnQNYGinT/n4/oFWrtO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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