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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a47663e5bf707de278d10d2b216728af4596d9e2e0594a727faff39cf4170d' 
  AND token = '+YRxx597rjpD/wx/BBbm6pbl4yyBpP8w/RzB1BIGS2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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