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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd0d3c0722ef900ad753b130554315cd9cb32b0e2710820adea0d432afc663a' 
  AND token = '9+igfPs92mTnUeURapC2P+7fnEwB3rUgK63Gzswsvmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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