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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736860cecc5729bd07e7a0b35868727ab57c3eec130c16593969e35b49a91ec1' 
  AND token = 'Dh0tKX0C5qdD5I7PCMxUXSm+l5fMKbJ02iPkqjIzMRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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