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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08206029e2d9bb9e216c2f6092423c87747540a6df6356c4b5d44ceb94c8d7c' 
  AND token = 'tvBX7qQn1wsceJfBzJtGf2XZ1e4+NN9x9Q7oBBB4pkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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