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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b331108caaef1e4b239112faeb532706a1f3a9f9ea102374db8a427b79f26ccd' 
  AND token = 'pdUDojGH0dbi4dr/QN0tjtOcDGv6hCCgKx2L4R3VruI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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