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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1fcb1133a4647493e48e2edb07797bc70cf68dd7356dd1ebb40b8df1354786' 
  AND token = 'sUZNPU+PwxrtdkI2O8bpf+29InjUEsgtvzLH6tk9PEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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