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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445c49a4088e79d60f00526838c4118876fdc4634cdd4f1e26c507c19123bcee' 
  AND token = 'Co+fBxRl8JDg0Tno3TnjU0i2sMD2U4vS9rwp3PBumV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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