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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62dd61cb84f43a9f254a48c1d8915f8d2c49023e880b60b6792391cb8d08b1b2' 
  AND token = 'WDTWJWDTuxNSzKiiAcEJYQ/NmCx2kT3c89j99fVe758=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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