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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52c7fea6a199f9fea2557ce59854d441f8d266a55a95fe2fbfa3747dc391045' 
  AND token = '9Cbkn3p2gM3rriIIej33gj1Bwml9iD47xPeb2Vs+qTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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