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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614001f10ec92702eda39f3bf1de188359c97b54be70ec3f6b7ca931bdff1ef5' 
  AND token = 'a1pEDyGm4KRxqrkgmNXUx1wPGlYhkGktjh+2QCExLi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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