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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a7430f03d8836bef082852dee1fbd161ca3fe7c5e1f76a85b3650bb47d9e15' 
  AND token = 'KscgeTOEXXIm3uLWSAb6kCx8Kc2oUQbNSB5Rp5UV8CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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