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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeaae26d8c73e3647aa2774d55301f9f103aa79ae7d4d7cc20269a0cedf82a04' 
  AND token = 'EML0RoDxseCgU7RHAvQ64H2bLrJuDlm99SIpR+a559g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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