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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000a9d360bbdf255132d107450cd8f3ee5e777d89485f13dab82fd3584e78558' 
  AND token = 'T1uz8yCiHPSZUkYgIamod/fpathYHDOOCBJRiFiqctM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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