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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce284e2ee26d53f579ba615e41e9c7e3759100d29fa59d9139c41419b2f95fd' 
  AND token = 'Pf1o4R6HUkxqNxps6kSjefvdgDhwpD2uDcNX3YcFWoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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