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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e714d46ab0abcb8e709601e8d3510793f22730b491dd8e88f06c9dd35503a4a' 
  AND token = '/wdmUoy0y3W08lB8BaTSzlmacwOVBF0z3KI3Ax2pmpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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