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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989739ab72deaf12792d33a8cfc3663667980da245439fd32395862e33ccfa6a' 
  AND token = 'RYJkxONSq1CX8Ec57YAqRkdgdWPRmdV/fjrB4u/I5iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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