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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115177c5ef0164d3a9fc3d02568020d05527adf265d8028ecff5cdcd3f48c2e5' 
  AND token = 'F+0kSg+Ob1D1x7SDEdWKOXU/kxram5gL1GToKdqV4Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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