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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8261ebd3c0920194d37c42b062de0f80fa7bfe8c36d1794baab8fdaf505bb8bb' 
  AND token = 'Q3pfNFyc9lpBV3C83bL3nSPiYtVbA3dZT+idkV8aLWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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