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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a31a8cc571f3d43aa5f9ed92e4206b4261c0d762cf23e4b77f6d29f4d2aaec' 
  AND token = '0+H480B5im2aKit7plh3m1qG4KYBtWeRrTaOBHG3ZfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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