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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b450d2da28f644452ddc6eadc05ba64e71085b557105e860408e66cc9fc1e134' 
  AND token = 'UfNWzKbHXnDOZKeZN2Yq5N5Nhnz0BSWMaskLx0pcdv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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