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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86ec9e36ebd27e8774015a3be11e4f941376c1692a0fb073b2a4969439eb5be' 
  AND token = 'XmDDDVSbHgZwtNJbpse1um6rTwesA2Ayq/vEWN0ndc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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