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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8954a4e1271f9f7c1da83c0b1ac7634e237bfbb08c8f00fa325aed67d373c14' 
  AND token = '/D5w9hGl2zHjHIkbCISGQZcdpbp37NZ4GroT5qwmjuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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