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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c86ad1655f54797b3d5a5a6b0a65978ee8a20f0c8d2a2842b3b3f3b1722b3c2' 
  AND token = '4F8JkcPeUxasq1s6jxm2ey60faryXaxfT0ejK4cSGkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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