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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a013ebbf5d18ec3f2b2baaee88000b4cd990c436daa0f9d0dcfa287a5f6aa09' 
  AND token = '7Ea4zTL07dn0XKBmSXOv4rb+/p3sCXbbzfCxSuxuNaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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