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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505f00379c243c8f2db4142db0335ea091b0eb868a297a9424aa5e1a51bb5802' 
  AND token = 'ME3LUF2f17if8H0oWNll+K1jTlnDNF6Y3Foa8sxsf2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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