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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb715b73d78bb30d13776c3a80cd14df9b5825e145a27e85b4bac0207083212' 
  AND token = 'lX4PVkBTR5N18upy2VfAQ5se+BL/wXBdP5jl8KNBoJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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