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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7da83cb8a121cb8260224e34ba0cb614c8621b569c1f09033199b26ba637de1' 
  AND token = 'h7IOgDLKZhvVAFmFQiNBJc7PVDh/dZ917V0E2JRXAyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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