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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9394834f5b0fed08ecea778d1b3872ee69f1264a1ab3d5f1c05f6a5458e7973' 
  AND token = 'xnFHncn2zVBY/zyPm6l/7gPtG7AiEU7UetdV6lFZ7vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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