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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1e94fd2865b3536e9a365f8b11fb5f47d056949f2f6969e5eda0029bdf83be' 
  AND token = '7bYLLf+j5C1VcldaXTN/l1wjs3iCFFbrAN4mHh8Ilv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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