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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c0e0add6ebddb5a4c57eef9b16296090b1ba310bfc2db49b56e8402523613b' 
  AND token = 'x2gzGteCMmpqUNZ/VTkbi8utvG/g0PrubEGSHcZfIPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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