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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17093b47b9355b5c9591a75e15ef4b620afa0114f0d2efdce8c8ae0a2fef435a' 
  AND token = 'uSRFW5qh48cJjeOK7dKojuBNWh9CqAR7+svZs/fIleE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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