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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62dff4c6685460512331f0edb240788e7a004bdfb2cfa9d68596e1c0b5c6cad' 
  AND token = 'NdcAiVt5xwVSArYJjggz2LS2JlVCozCFTDQGMhmukSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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