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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff9dedec2f8bd72ab94eda9de9e6f41fc861ac3c64d813f42ca496dae01e5a5' 
  AND token = 'uFNmabV6ll+Thqz3gq+yhI750hsVHc28JXH6U+pfzQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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